Messages in this thread | | | Subject | Re: [all better] Re: regression: massive trouble with fpu rework | From | Mike Galbraith <> | Date | Mon, 29 Jun 2015 14:27:23 +0200 |
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On Mon, 2015-06-29 at 10:33 +0200, Borislav Petkov wrote:
> I bet it is that > > /* Unmask CPUID levels if masked: */ > if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) { > if (msr_clear_bit(MSR_IA32_MISC_ENABLE, > MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) { > c->cpuid_level = cpuid_eax(0); > get_cpu_cap(c); > } > } > > in early_init_intel(). If you feel like playing, you might comment it > out to see what happens.
With it commented out, and fpu__init_system() either back at previously booting position [5] or at original [0], doesn't matter, box is dead, but differently. It stalls after setting clocksource to tsc, and just sits there.
-Mike
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